The missing piece of the puzzle is the . These are the "System Software" files that RetroArch needs to mimic the original hardware's behavior. Without them, high-end emulation simply isn't possible. Where to Find RetroArch BIOS Files (The "Link" Question)
Copy your .bin or .pce files directly into the system folder. Do not put them in subfolders unless specifically required by a core. bios files for retroarch ps vita link
Ensure all filenames are lowercase . For example, SCPH5501.BIN should be renamed to scph5501.bin . RetroArch is case-sensitive and will not recognize uppercase filenames. How to Verify if Your BIOS is Working The missing piece of the puzzle is the